The quality of being fervid; intense passion, heat, or enthusiastic feeling expressed with great emotion.
From the adjective 'fervid' (from Latin 'fervidus') plus the abstract noun suffix '-ity', which creates nouns expressing qualities or conditions from adjectives.
The '-idity' ending gives fervidity a scientific, almost clinical sound—useful for describing the fervidity of a scientist's research obsession or the fervidity of a zealot's beliefs with a touch of distance.
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